FWIW, Heidelberg ColorToolbox has always offered an option to generate a CMY only ICC profile from standard characterization data. / Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Mike Strickler Sent: 5 janvier 2016 17:05 To: colorsync-users@lists.apple.com Subject: Re: FOGRA39 CMY-only profile (no black) Sometimes it's tempting to try to help someone solve a problem just because we can, without asking whether it's really a problem after all. If I understand this correctly, the end goal is to limit the use of black in an output profile. Passing for the moment on whether the objective is a sound one, I might suggest that you start with full CMYK data set and edit the black generation in the profiling app. There you make the black as skeletal as you like. As for free beer, let's say that i1Profiler can be had for about the same as 60 bottles of fine Belgian ale at my local yuppie market. Mike Strickler MSP Graphic Services
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Message: 3 Date: Tue, 05 Jan 2016 13:28:48 +0000 From: Martin Orpen <martin@idea-digital.com> To: "'colorsync-users?lists.apple.com' List" <colorsync-users@lists.apple.com> Subject: Re: FOGRA39 CMY-only profile (no black) Message-ID: <02E4B32E-C087-46ED-AB81-A8CF4B91E351@idea-digital.com> Content-Type: text/plain; charset=utf-8
On 5 Jan 2016, at 11:50, Jorge . <chocolate.camera@gmail.com> wrote:
Maybe I am making this too convoluted and I should not be trying to do this by creating a custom profile? Is there any other way to convert to a specific CMYK color space, preferably with Photoshop, but altering the default separation algorithm so that K is not used and CMY are increased in order to compensate that lack so that colors remain as close as possible to the original, taking also into account a custom TAC? I do understand that the deviation from the original colors will inevitably be higher on black-ish tones if no K is used.
I’m not sure what else you’d expect to happen here?
If you build the ICC profile in Argyll using -kz -l300 -L0 you are going to create CMYK with no K and the CMY channels compensating as best they can for the missing K.
Keep in mind that you'll need a pro CMYK proofing system to appreciate and validate the results of these conversions — Photoshop isn’t going to be very useful…
And, if you want to keep things really simple, why not just invert the RGB channels and avoid black generation altogether ;-)
-- Martin Orpen Idea Digital Imaging Ltd
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